"As good as a Kohler Cimmeron", doesn't give me warm and fuzzy feelings. My suggestion is to look at the Toto line. There are some Beige options that may be fairly close. One of the problems when buying colored fixtures is they go out of style. Keep in mine that even if the color you find does not exactly match, the eye really doesn't notice slight differences unless they are pointed out. I have 2 Toto toilets in my home, a Drake and a Dartmouth, and we do not find there is a noise problem. Low flow toilets flush very quickly because of the small amount of water used, so there is a bit more sound than the old 5 gallon monsters we used to use where the water rose slowly and the flush was very quite, but those days are gone. I think you are worrying over nothing.